Sandal upper



FIG. 1 is a top perspective view of my sandal upper. The broken lines show the remainder of the sandal with which my upper is used and form no part of the claimed design;

FIG. 2 is a top perspective view showing my upper design with the straps opened;

FIG. 3 is a top plan view of my upper design;

FIG. 4 is a right side elevation view of my upper design;

FIG. 5 is a left side elevation view of my upper design; and,

FIGS. 6 and 7 are, respectively, front and rear elevation views of my upper design. 

The ornamental design for a sandal upper, as shown and described. 